Download - Stair Construction
Stair design and
construction
Brisbane City Hall staircase
Brisbane North Point Institute of
TAFECertificate 3 in Stonemasonry
BCF3027A Lay stair & floor surfaces
Stair facts• In February 2003,
Canberra’s Paul Crake won the Empire State Building ‘run-up’ for the fifth consecutive time
He ran up• 86 levels• 1576 stairs• Rising 303m from start
to finishin 9 minutes 33 seconds!
That’s • 3.52m per level• Average 18.3 steps
per level• 192.25mm per step
Stair factsPaul ascended 1576 steps
through 86 levels to rise 303m
Stair geometryStair safety and geometry are related-
rhythmic movement along a straight line is important for safe ascent or descent
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Stair proportionsImperial (feet and inches)Rise (R) ≥ 6”; Going (G) ≤ 12”1. 2R” + G” = 23”2. 17” ≤ (R” + G”) ≤ 17.5”3. 70” ≤ (R” x G”) ≤ 75”Metric150mm ≤ R ≤ 215mm; 215mm ≤ G ≤
305mm4. 45 000 ≤ (Rmm x Gmm) ≤ 48 000
Stair anglesAccording to AS 1657-1992 (Fixed
platforms, walkways, stairways & ladders- Design, construction & installation), stairways should be angled between 26.50 and 450-
That’s between 1 in 2 and 1 in 1
Rise = 1Going = 2
Rise = 1Going =
126.50
450
AS 1657-1992 Fixed platforms, walkways, stairways & ladders- Design, construction & installation
(p 5)
Limits of slope
AS 1657-1992 fig 1.1
Stairway rises & goingsAS 1657-1992 fig. 4.3
AS 1657-1992 Fixed platforms, walkways, stairways & ladders- Design, construction & installation (p 14)
Stair words
• Baluster• Balustrade• Go• Going• Handrail• Headroom
•Rise•Riser•Stair•Step•Tread•Wall string
•Landing•Newel post•Nosing•Outer string•Pitch•Pitch line
Stair type 1
Straight flight stair
• 4.1 Stairways >600mm between handrails
• 4.1 Slope not less than 26.50 & not more than 450
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Straight two-flight stair with half-landing
• 4.2.1 stairs constructed in flights straight or curved horizontally
• 4.2.2 Number of rises not to exceed 18 in a flight; not more than 36 rises without a change in direction
Stair type 2
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Quarter-turn stair with landing
• 4.3.1 All treads to be slip resistant, with provision made for drainage
• 4.3.1 (a) Rises & goings (in the same flight) to be within ± 5mm
Stair type 3
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Dogleg stair with half-landing
• 4.3.2 Head clearance min 2000mm vertically from nosing of tread
• 4.3.3 Nosing of tread must be highlighted
Stair type 4
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Open-well stair with two quarter landings
• 4.3.1 (b) Each rise not less than 150mm & not more than 215mm
• 4.3.1 (c) Each going not less than 215mm & not more than 305mm
Stair type 5
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Quarter-turn stair with winders• 4.4 Landings:
• (a) Length & width must be not less than the stairway
• (b) Landing minimum vertical clearance 2000mm
• (c) Every access landing- standing space at least 600mm clear of cross-traffic or door swing
Stair type 6
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Spiral stair with central column
• 4.2.3 Radius to centre line of stairway not less than 600mm; where radius to centre line is less than 3000mm, maximum width of curved stairway 750mm
Stair type 7
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Circular stair with central well
• 4.3.1 (c) Each Going not less than 215mm & not more than 305mm
Stair type 8
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)
Geometric stair (900) turn
• 4.3.1 (d) 45 000< RxG <48 000
• 4.3.1 (e) Tread width must not be less than the going and there must be an overhang of at least 10mm
Stair type 9
Milton, H.J. (1994). Glossary of Building Terms. Standards Australia, Sydney (p 364)